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Dow Hydrocarbons & Resources LLC - Grand Bayou Operations

Chemical And Fertilizer Mining, Belle Rose, Louisiana. NPDES permit LA0049310, in force until Oct 31, 2029. Last 12 months: over a limit once (last December 2025). Source: EPA ECHO, Oct 22, 2026.

Reports due

About 28 days after each period: outfall 001 form Q quarterly (8 values), outfall 002 form Q quarterly (8 values), outfall 004 form Q quarterly (8 values), outfall 106 form Q quarterly (11 values), outfall 104 form S twice a year

Last report on file

June 2026

Oct 2024 – Sep 2025

2 values over a limit, 0 required values missing, 0 of 18 reports late

Last 12 months (Oct 1, 2025 – Sep 30, 2026)

Limits in force (43)

How strict are these limits?

• Chloride [as Cl], daily maximum 500 mg/L — stricter than 41% of 24 other minor industrial and other permits in Louisiana; 25% have the same limit
• Solids, total suspended, daily maximum 45 mg/L — stricter than 18% of 551 other minor industrial and other permits in Louisiana; 59% have the same limit
• Benzene, daily maximum 50 ug/L — stricter than 16% of 127 other minor industrial and other permits in Louisiana; 80% have the same limit

Cited limits by parameter: Louisiana's rules and the federal ones.

Same industry: the 4 Mining and Quarrying of Nonmetallic Minerals permits in Louisiana.

On EPA ECHO: Facility report · DMR history

Your permit document is the final word. As JSON: /api/v1/permits/LA0049310 · MCP: https://passage-data.com/mcp